Hi Bill and others,
do you remember? You helped me last year in using the
Delaunay-Triangulation of VisAD to create a Java3D Shape3D terrain.
Now, I am trying something similar. I just want to create a terrain
struxture out of a regular raster.
I used a Linear2DSet in the example and I am getting a shape, but I don't
want any scaling in my result. I tried setting
eastMap.setRange(-1.0, 1.0);
northMap.setRange(-1.0, 1.0);
heightMap.setRange(-1.0, 1.0);
which you suggested last year. But then the Shape is not longer displayed.
The example program is attached.
Thanks in advance Desiree
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Desiree Hilbring
Institut fuer Photogrammetrie und Fernerkundung
Universitaet Karlsruhe, Germany
email: hilbring@xxxxxxxxxxxxxxxxxxxx
# 0721 6083676
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/*
VisAD Tutorial
Copyright (C) 2000 Ugo Taddei
*/
// Import needed classes
import visad.*;
import visad.java2d.DisplayImplJ2D;
import java.rmi.RemoteException;
import java.awt.*;
import javax.swing.*;
import java.awt.event.*;
import visad.java3d.DisplayImplJ3D;
/**
VisAD Tutorial example 3_09
We have the functions altitude = h(latitude, longitude)
temperature = f(latitude, longitude)
represented by the MathType
( (latitude, longitude) -> (altitude, temperature ) )
Map the altitude to IsoContour and temperature to RGB
Run program with "java P3_09"
*/
public class TerrainGridDes{
// Declare variables
// The domain quantities longitude and latitude
// and the dependent quantities altitude, temperature
private RealType eastValues,northValues;
private RealType heightValues;
// Two Tuples: one to pack longitude and latitude together, as the domain
// and the other for the range (altitude, temperature)
private RealTupleType domain_tuple;
// The function (domain_tuple -> range_tuple )
private FunctionType func_en_h;
// Our Data values for the domain are represented by the Set
private Set domain_set;
// The Data class FlatField
private FlatField vals_ff;
// The DataReference from data to display
private DataReferenceImpl data_ref;
// The 2D display, and its the maps
private DisplayImpl display;
private ScalarMap eastMap, northMap, heightMap;
public TerrainGridDes(String []args)
throws RemoteException, VisADException {
// Data from ascii-file
/*
float[] east = {100,100,100,100,150,150,150,150,200,200,200,200};
float[] north = {100,150,200,250,100,150,200,250,100,150,200,200};
float[] height = {50,310,99,445,120,310,810,99,100,601,702,109};
*/
float[] east = {3532500,3532500,3532500,3532550,3532550,3532550};
float[] north = {5379500,5379550,5379600,5379500,5379550,5379600};
float[] height = {688.8f,688.6f,688.4f,688.3f,688.4f,688.5f};
// Create the quantities
// Use RealType(String name);
eastValues = new RealType("eastValues");
northValues = new RealType("northValues");
domain_tuple = new RealTupleType(northValues,eastValues);
heightValues = new RealType("heightValues");
// Create a FunctionType (domain_tuple -> range_tuple )
// Use FunctionType(MathType domain, MathType range)
func_en_h = new FunctionType(domain_tuple, heightValues);
// Create the domain Set
// Use LinearDSet(MathType type, double first1, double last1, int
lengthX,
// double first2, double last2, int
lengthY)
int NCOLS = 2;
int NROWS = 3;
//domain_set = new Linear2DSet(domain_tuple, 100, 250, NROWS,
// 100, 200, NCOLS);
System.out.println("nCols "+NCOLS);
System.out.println("nRows "+NROWS);
System.out.println("5379000, 5380000, 3532000, 3533000");
domain_set = new
Linear2DSet(domain_tuple,5379000,5380000,NROWS,3532000, 3533000, NCOLS);
// Get the Set samples to facilitate the calculations
float[][] set_samples = domain_set.getSamples( true );
// We create another array, with the same number of elements of
// altitude and temperature, but organized as
float[][] flat_samples = new float[1][NCOLS * NROWS];
// ...and then we fill our 'flat' array with the generated values
// by looping over NCOLS and NROWS
// specifiy height
for(int c = 0; c < NCOLS; c++)
for(int r = 0; r < NROWS; r++){
flat_samples[0][c*NROWS+r] = height[c*NROWS+r];
System.out.println("height "+height[c*NROWS+r]);
}
// Create a FlatField
// Use FlatField(FunctionType type, Set domain_set)
vals_ff = new FlatField( func_en_h, domain_set);
// ...and put the values above into it
// Note the argument false, meaning that the array won't be copied
vals_ff.setSamples( flat_samples , false );
// Create Display and its maps
// A 2D display
display = new DisplayImplJ3D("display1");
// Create the ScalarMaps: latitude to XAxis, longitude to YAxis and
// altitude to RGB and temperature to IsoContour
// Use ScalarMap(ScalarType scalar, DisplayRealType display_scalar)
eastMap = new ScalarMap( eastValues, Display.YAxis );
northMap = new ScalarMap( northValues, Display.XAxis );
heightMap = new ScalarMap(heightValues,Display.ZAxis);
// Add maps to display
display.addMap( eastMap );
display.addMap( northMap );
display.addMap( heightMap );
/*
eastMap.setRange(-1.0, 1.0);
northMap.setRange(-1.0, 1.0);
heightMap.setRange(-1.0, 1.0);
*/
// Create a data reference and set the FlatField as our data
data_ref = new DataReferenceImpl("data_ref");
data_ref.setData( vals_ff );
// Add reference to display
display.addReference( data_ref );
// Create application window and add display to window
JFrame jframe = new JFrame("VisAD Tutorial example TerrainGridDes");
jframe.getContentPane().add(display.getComponent());
// Set window size and make it visible
jframe.setSize(300, 300);
jframe.setVisible(true);
}
public static void main(String[] args)
throws RemoteException, VisADException
{
new TerrainGridDes(args);
}
} //end of Visad Tutorial Program 3_09
